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trick, that can be used in many mathematical situations. With such tricks, it is usually difficult, and in any case not desirable, to formalize them as lemmas: if you try to do so then almost certainly your formal lemma will not apply in all the situations where the trick does.

Of course, in many cases, the devil really is in the details, but nevertheless knowing the overall strategy of proof is extremely valuable when trying to read that proof.

Yong-Hui Says: November 3, 2008 at 5:57 pm | Reply I am in MSRI for the cofference discrete Rigity. Green will give the first lecture. I just happen to find a question for that tricki wiki: Whether is there a common-shared refference system for that tricki wiki? Similar to that of Mathscinet of ams math review It will be a basic instrument for a mathematical website.

有人说，基础基础，何时是了？天天打基础，何时是够？据我看来，要真正打好基础，有两个必经的过程，即“由薄到厚”和“由厚到薄”的过程。“由薄到厚”是学习、接受的过程，“由厚到薄”是消化、提炼的过程。譬如我们读一本书，厚厚的一本，加上自己的注解，就愈读愈厚，我们所知道的东西也就“由薄到厚”了。但是，这个过程主要是个接受和记忆的过程，“学”并不到此为止，“懂”并不到此为透。要真正学会学懂还必须经过“由厚到薄”的过程，即把那些学到的东西，经过咀嚼、消化，融会贯通，提炼出关键性的问题来。我们常有这样的体会：当你读一本书或是看一迭资料的时候，如果对它们的内容和精神做到了深入钻研，透彻了解，掌握了要点和关键，你就会感到这本书和这迭资料变薄了。这看起来你得到的东西似乎比以前少了，但实质上经过消化，变成精炼的东西了。不仅仅在量中兜圈子，而有质的提高了。只有经过消化提炼的过程，基础才算是巩固了，那么，在这个基础上再练，那就不是普通的练功了；再念书，也就不是一本一本往脑里塞，而变成为在原有的基础上添上几点新内容和新方法。经过“由薄到厚”和“由厚到薄”的过程，对所学的东西做到懂，彻底懂，经过消化的懂，我们的基础就算是真正的打好了。有了这个基础，以后学习就可以大大加快。这个过程也体现了学习和科学研究上循序渐进的规律。

2007信息安全界59牛人